Rivers of London by Ben Aaronovitch

An exciting, if totally ridiculous book about a secret, magical division of the metropolitan police force.  This is the first part of a trilogy following Peter Grant, a new recruit to a wizard inspector, who is learning magic as he embarks on his policing career.  This is excellent escapism as the plot is humerous, believable (within the confines of a magical universe) and easy to read.  The writing is never going to be the attraction to this book but at the same time it is light, often illuminating and certainly never jarring.  Very readable, very good fun and enjoyable.